Twin-beam luminaire lens
AssigneeArmstrong Cork Company
InventorGrafton K. Barbson
Life of this patent
Estimating the term…
Abstract
A luminaire lens is provided with a prism arrangement which emits light in two beams. A two-light tube fixture is utilized with approximately the same amount of light coming from the 0.degree. to 30.degree. zone of candlepower distribution and the 30.degree. to 60.degree. zone of candlepower distribution, with very little light emitted from the 60.degree. to 90.degree. zone of candlepower distribution.
Claims4
An elongated luminaire for illuminating an area therebelow comprising a linear light source of two tubes and an elongated lens having a bottom section and two side sections on either side of the bottom section, said side sections being inclined at an angle from a line perpendicular to the plane of the bottom section of the luminaire, said sections having prisms formed on the side thereof facing the light source, said prisms constituting light incident and light emergent surfaces for redirecting and emitting light rays from the light source generally away from the vertical plane through and parallel to the axis of said linear light source and into annular ranges on either side thereof with substantially half of the light distributed in an area from 0.degree. to 30.degree. on each side of the vertical plane, and substantially the other half of the light distributed in an area from 30.degree. to 60.degree. on each side of the vertical plane.
An elongated luminaire for illuminating an area therebelow comprising a linear light source of two tubes and an elongated lens having a bottom section, said bottom section of the luminaire is formed with a series of prisms extending from the center of the bottom section of the luminaire to the edge of the luminaire, with one of the included angles of the prism being fixed in size and another included angle of the prism increasing as one progresses from the centermost prism to the edgemost prism of the bottom section, said sections having prisms formed on the side thereof facing said light source, said prisms constituting light incident and light emergent surfaces for redirecting and emitting light rays from said light source generally away from a vertical plane through and parallel to the axis of the linear light source and into annular ranges on either side thereof with substantially half of the light distributed in an area from 0.degree. to 30.degree. on each side of the vertical plane, and substantially the other half of the light distributed in an area from 30.degree. to 60.degree. on each side of the vertical plane.
An elongated luminaire for illuminating an area therebelow comprising a linear light source of two tubes and an elongated lens having a bottom section and two side sections on either side of the bottom section, said bottom section of the luminaire is formed with a series of prisms extending from the center of the bottom section of the luminaire to the edge of the luminaire, with one of the included angles of the prism being fixed in size and another included angle of the prism increasing as one progresses from the centermost prism to the edgemost prism of the bottom section, said sides of the luminaire having a plurality of prisms which extend from adjacent the bottom section of the prism to adjacent the top of the lens side by the ceiling mounting the elongated luminaire and said prisms have a fixed size included angle and an included angle which increases in size as one moves from adjacent the bottom section of the lens to adjacent the top of the lens side, said sections having said prisms formed on the side thereof facing said light source, said prisms constituting light incident and light emergent surfaces for redirecting and emitting light rays from said light source generally away from a vertical plane through and parallel to the axis of the linear light source and into annular ranges on either side thereof with substantially half of the light distributed in an area from 0.degree. to 30.degree. on each side of the vertical plane, and substantially the other half of the light distributed in an area from 30.degree. to 60.degree. on each side of the vertical plane.
Dependencies are inferred from the claim text.